Re: references to histos

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Hi Maurizio,
TH1::ProjectionX returns a TH1D.
DO:

TH1D *h = cross[i]->ProjectionX(proj_th[i],j,j+1,"E")
h->Draw();

Rene Brun


Maurizio Ungaro wrote:
> 
> Hi all,
> I'm using the command (thanks to giving us that)
> 
>  cross[i]->ProjectionX(proj_th[i],j,j+1,"E")
> 
> to project a 2D histos (cross) in to slices.
> where proj_th[i] is a string.
> 
> Now, how can I refer to proj_th[i] ?
> 
> If I tried
> 
>         proj_th[i]->Draw()
> 
> of course doesn't work.
> 
> I tried
> 
> pr[i]=new TH1D(proj_th[iQ2],"Cross section cos(theta*)",10,-1,1);
> 
> before the projection, i.e. before
> 
>  cross[i]->ProjectionX(proj_th[i],j,j+1,"E")
> 
> but then the histo pr[i]
> is empty.
> 
> Suggestion on what I'm doing wrong?
> 
> Maurizio

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